.commitopacity{
    position:absolute;
    width:100%;
    height:100px;
    background:#7f7f7f;
    filter:alpha(opacity=50);
    -moz-opacity:0.8;
    -khtml-opacity: 0.5;
    opacity: 0.5;
    top:0px;
    z-index:99999;}
.jzts{
    position: fixed;
    left: 50%;
    top: 50%;
    width: 100%;
    height: 200px;
    margin: -45px 190px 0px 0px;
}